Condensed Consolidated Statements of Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Earnings from equity method investments	29	34	78	80
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Natural gas
Operating Expenses:
Total cost of sales	199	452	1,097	1,546
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Fuel
Operating Expenses:
Total cost of sales	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Total cost of sales	231	408	473	640
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	$ 852	$ 1,083	$ 2,728	$ 3,140
Operating Expenses:
Cost, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Other operations and maintenance	$ 309	$ 266	$ 615	$ 570
Depreciation and amortization	143	138	284	275
Taxes other than income taxes	59	62	161	163
Total operating expenses	710	918	2,157	2,554
Operating Income	142	165	571	586
Other Income and (Expense):
Earnings from equity method investments	28	31	72	71
Interest expense, net of amounts capitalized	(73)	(61)	(150)	(122)
Other income (expense), net	17	16	32	32
Total other income and (expense)	(28)	(14)	(46)	(19)
Earnings Before Income Taxes	114	151	525	567
Income taxes (benefit)	29	36	132	134
Net Income	85	115	393	433
SOUTHERN Co GAS | Natural gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Operating Expenses:
Total cost of sales	$ 199	$ 452	$ 1,097	$ 1,546